Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 306
ess of the solaratmosphere, while the rays from points of the Suns body whichappear to us near the limbs pass, on the contrary, through the maxi-mum thickness of atmosphere, and are thus longest subjected to itsabsorptive action. The Solar Spots.—When the Suns disk is examined withthe telescope… … Fig. 166.—A Large Sun-spot seen in the Telescope. Solar spots generally have a black central nucleus orumbra, surrounded by a border or penumbra, intermediatein shade between the central blackness and the brightphotosphere. The first printed account of solar spots was given byFabrititjs in 1611,…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
